﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage;
using Windows.Storage.Streams;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234237

namespace Program_FileIO
{
    /// <summary>
    /// A basic page that provides characteristics common to most applications.
    /// </summary>
    public sealed partial class MainPage : Program_FileIO.Common.LayoutAwarePage
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        const string filename = "sample.dat";

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
           // CreateFileAsync();
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
        }

        private async void Button_Click_1(object sender, RoutedEventArgs e)
        {
            StorageFolder storageFolder = KnownFolders.DocumentsLibrary;
            StorageFile sampleFile = await storageFolder.GetFileAsync(filename);
            await FileIO.WriteTextAsync(sampleFile, inputText.Text);
            
        }

        private async void CreateFileAsync()
        {
            StorageFolder storageFolder = KnownFolders.DocumentsLibrary;
            StorageFile sampleFile = await storageFolder.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
            outputText.Text = "The file '" + sampleFile.Name + "' was created.";
        
        }

        private async void Button_Click_2(object sender, RoutedEventArgs e)
        {
            StorageFolder storageFolder = KnownFolders.DocumentsLibrary;
            StorageFile sampleFile = await storageFolder.GetFileAsync(filename);

            var stream = await sampleFile.OpenAsync(FileAccessMode.Read);
            var size = stream.Size;
            using (var inputStream = stream.GetInputStreamAt(0))
            {
                DataReader reader = new DataReader(inputStream);
                uint length = await reader.LoadAsync((uint)(stream.Size));
                outputText2.Text = reader.ReadString(length);
            }

           // outputText2.Text = await FileIO.ReadTextAsync(sampleFile);
        }
    }
}
